Answer:
x=2
Explanation:
We will need to add our like terms. In this case:
x2 (which is exactly the same as 2x) and -18x are like terms because they both have a coefficient of x.
81 and 49 are like terms because they are both constants.
x2-18x+81=49
2x-18x+81=49
-16x+81=49
-16x=-32
x=2
